<template>
  <h2>当前求和为：{{sum}}</h2>
  <button @click="sum++">点我++</button>
  <hr>
  <h2>姓名：{{name}}</h2>
  <h2>年龄：{{age}}</h2>
  <h2>职位：{{job.j1.position}}</h2>
  <h2 v-show="person.car">座驾信息：{{person.car}}</h2>
  <button @click="name+='~'">修改姓名</button>
  <button @click="age++">增长年龄</button>
  <button @click="job.j1.position+='~'">修改职位</button>
  <button @click="showRawPerson">输出最原始的person</button>
  <button @click="addCar">给人添加一台车</button>
  <button v-show="person.car" @click="person.car.name+='!'">换车名</button>
  <button v-show="person.car" @click="changePrice">换价格</button>
</template>

<script>
import { reactive, ref, toRefs, toRaw, markRaw } from "vue";
export default {
  name: "Demo",
  setup() {
    // 数据
    let sum = ref(0);
    let person = reactive({
      name: "张三",
      age: 18,
      job: {
        j1: {
          position: "新生代农民工"
        }
      },
      // car: {}
    });

    function showRawPerson() {
      const p = toRaw(person)
      p.age++
      console.log(p)
    }

    function addCar() {
      let car = {name: '奔驰', price: '40'}
      // person.car = car
      person.car = markRaw(car)
    }

    function changePrice() {
      person.car.price++
      console.log(person.car.price)
    }
    
    // 返回一个对象（常用）
    return {
      person,
      ...toRefs(person),
      sum,
      showRawPerson,
      addCar,
      changePrice
    };
  }
};
</script>